‘Snowball Earth’—a problem for the supposed origin of multicellular animals

Many uniformitarian scientists believe that about five major periods, and several
short periods, of glaciation have occurred on Earth.1 In the evolutionary time scale, these ice age periods sometimes
lasted several hundred million years and extended back 2–3 billion years ago.
These supposed ice ages have been interpreted from till-like rocks2 and other apparent glacial signatures observed within sedimentary
rocks around the world. One such ice age is called the Neoproterozoic, or Late Precambrian,
and thought to have started about 950 million years ago and ended about 520 million
years ago.3 During this 430 million-year
period, according to evolutionary time, there were several long ‘glacial’
and ‘interglacial’ periods.

‘Snowball Earth’ hypothesis

Based on early paleomagnetic studies, evolutionists deduced that
most Precambrian ‘ice ages’, including the one about 2.5–2.2 billion
years ago extended as far south as the equator.4
This radical proposal caused many scientists to question the paleomagnetic results,
mainly because it is easy to remagnetize rocks. After many paleomagnetic measurements
and several decades (i.e. Sohl, Christie-Blick and Kent5), the idea of an equatorial ice sheet, implying a completely
glaciated Earth, has become widely accepted. Kerr writes:

‘And last year, most researchers agreed that one part of
the sweeping hypothesis—the claim that glaciers once flowed into ice-covered
tropical seas—is correct … .’6

This is the ‘snowball Earth’ hypothesis. John Crowell,
one of the chief investigators of supposed ancient ice ages, had been skeptical
of the paleomagnetic measurements for several decades, but now has accepted the
measurements.

There are several major problems with the idea that ice sheets
reached the tropics at low elevation. One problem is that, once ice and snow covered
the entire Earth, a frozen Earth would maintain itself indefinitely by ice-albedo
positive feedback. Ice and snow have a high albedo, which causes most of the solar
radiation to be reflected back to space. Without atmospheric warming, the temperature
of the Earth would plummet far below freezing and the frozen condition would become
very stable. So, a catastrophic climatic event would be required to melt a ‘snowball
Earth’.

How could life have survived?

The Cambrian period and its supposed ‘explosion’ of
life occurred around 550 million years ago.7
This means that the worldwide Neoproterozoic ice age was raging during, or just
at the end of, the time when multicellular life exploded over the Earth. The origin
of multicellular life would have occurred earlier, at the beginning of the supposed
ice age, since some metazoan life occurs between 1,000 and 700 million years ago
according to their time scale.8 The
origin of life itself has already been pushed back to over 3 billion years ago.
So, it seems that evolutionists now have a serious problem with the supposed evolution
of multicellular life. Kerr asks:

‘How could life have survived … in a world in which
the average surface temperature would have hovered around –50oC,
not to mention the all-encompassing sea ice that would average a kilometer thick
compared to the Arctic Ocean’s few metres?’6

In a later article, he asks:

‘How could early life have weathered such a horrendous environmental catastrophe
without suffering a mass extinction? … How could algae and perhaps even early
animals have survived 10 million years sealed off by globe-girdling ice?’9

Hyde et al. reinforce this concern:

‘But this period was a critical time in the evolution of
multicellular animals, posing the question of how early life survived under such
environmental stress.’8<

It seems like evolutionists are caught in a bind.

The problem of the cap carbonates

Now that most geologists have accepted that the Earth was covered with snow and
ice while multicellular life was evolving, another perplexing problem needs to be
explained. This is the problem of the cap carbonates, which have a high amount of
dolomite. The cap carbonates are interpreted as warm-water rocks because dolomite
requires hot water to precipitate from solution. These rocks are very common directly
above the Neoproterozoic ‘ice age’ deposits, sometimes with
a knife-sharp contact.10 The textures
of the cap carbonates often indicate rapid precipitation from warm seas
saturated with carbonate.11 Hoffman
and Schrag state the significance of such an abrupt transition to the cap carbonates:

‘But the transition from glacial deposits to these “cap”
carbonates is abrupt and lacks evidence that significant time passed between when
the glaciers dropped their last loads and when the carbonates formed.’12

‘Snowball Earth’ followed by a rapid hothouse is considered
doubly bizarre to some geologists.11 Even more strange
is the fact that the hothouse existed before and during the ‘ice
ages’ based on the distribution of other carbonates associated with the ‘ice
age’ deposits. Carbonates are located below Late Precambrian ‘ice age’
deposits, and in Scotland carbonates, including dolomite, are interlayered within
‘glacial’ deposits.13
Carbon isotope ratios in the cap carbonates also appear to reinforce the idea that
practically all life died out during the ‘ice age’.14

Uniformitarian scientists used to say that the carbonates associated
with ‘glacial’ deposits were ‘cold-water’ carbonates, citing
evidence from patches of biogenetic carbonate that form in cold water today.15 This was obviously a dodge. Now, they
are simply accepting the temperature implications of these cap carbonates at face
value and postulating a ‘hothouse’ immediately after the ‘glaciation’.

The freeze-fry model

Evolutionists are back to the drawing board in trying to explain
how life supposedly blossomed while such overpowering catastrophes were taking place.
Hoffman and Schrag12 have proposed a radical hypothesis
that they believe explains the oscillating freeze-fry climate, as well as the mystery
of the origin and evolution of multicellular life. Hoffman and Schrag agree that
‘snowball Earth’ would have been an ice age catastrophe of monumental
proportions:

‘Dramatic as it may seem, this extreme climate change [Late Cenozoic ice age]
pales in comparison to the catastrophic events that some of our earliest microscopic
ancestors endured around 600 million years ago. Just before the appearance of recognizable
animal life, in a time period known as the Neoproterozoic, an ice age prevailed
with such intensity that even the tropics froze over.’16

They say only geothermal heat kept the oceans from freezing clear
to the bottom, leaving all but a tiny fraction of the planet’s microscopic
organisms to die. The heat near hydrothermal vents kept only patches of life going.
Hoffman and Schrag grudgingly agree to the necessity of a hothouse immediately following
this catastrophe:

‘To confound matters, rocks known to form in warm water
seem to have accumulated just after the glaciers receded.’17

They then propose an hypothesis that produces the ‘snowball
Earth’ followed by its rapid reversal to a hothouse. It is this hothouse that
subsequently caused the rapid diversification of multicellular life. Suddenly,
the bizarre sequence of events is now ‘expected’.18 This is just one example out of hundreds of the incredible plasticity
and unfalsifiability of the evolutionary/uniformitarian paradigm.

How does Earth transform from a snowball into a steam bath? In
storytelling suspense, typical of evolutionary scenarios, Hoffman and Schrag12 explain that volcanoes popped through the ice and belched
life-saving carbon dioxide. The extra carbon dioxide in the atmosphere supposedly
caused a super greenhouse effect. But, another problem arises, as the hothouse is
also precarious to life: ‘Any creatures that survived the icehouse must now
endure a hothouse’.16 If one such freeze-fry
episode seems fantastic, this scenario supposedly repeated itself four times during
the Late Precambrian and at least once during the Mid Precambrian.4

Origin of banded-iron formations

The freeze-fry model is also supposed to solve another great mystery of geology—the
origin of banded-iron formations.11,19 In the freeze-fry story, millions of years of ice cover would
deprive the oceans of oxygen, causing iron from hydrothermal vents to become soluble
in the ocean water. Once the ice melted, oxygen would mix into the ocean and cause
the iron to precipitate. However, if the oceans lost their oxygen, how could life
survive around those deep-sea vents? Another problem with attempting to solve this
puzzle is that banded-iron formations not only follow ‘ice ages’, as
predicted by the theory, but are also mixed down into the ‘glacial’
deposits.13 Complicating the issue even more, there
are no banded-iron formations after the Late Precambrian ‘ice age’.

Expanding their theory, Hoffman and Schrag apply the freeze-fry model to future
climates by predicting dire consequences of global warming that is assumed to result
from increased carbon dioxide today:

‘Certainly during the next several hundred years, we will be more concerned
with humanity’s effects on climate as the earth heats up in response to carbon
dioxide emissions … but could a frozen world be in our more distant future?’20

Forced models

Climate modellers used to pay no attention to the snowball Earth
hypothesis. However, now that they believe it is ‘proved’, they have
attempted to model it by computer climate simulations. Interestingly, many of the
modelling efforts are having problems coming up with a totally glaciated Earth.9 For instance, the model of Hyde et al. failed
to produce a ‘snowball Earth’.8 However,
their model does provide hope for multicellular life in another way—by
keeping areas of open water at the equator. However, Scrag and Hoffman21 do not believe that the ‘slushball earth’ model
of Hyde et al. agrees with the geologic and paleontologic data. The geological
record supposedly indicates that the oceans were completely sealed off or close
to it, say the proponents of ‘snowball Earth’.9
Neither do Hyde et al. agree with ‘snowball’ Earth, pointing
out many serious problems.22

One difficulty computer modellers encounter is to generate enough
carbon dioxide to melt the ice as demonstrated by Hoffman and Schrag.14
In order to reverse the ‘snowball Earth’, the concentration of carbon
dioxide in the atmosphere would need to be 350 times the current atmospheric concentration.23 This is a tough challenge for volcanoes,
which are more likely to cause cooling by volcanic ash and aerosols than warming
by carbon dioxide.24 Models of course
are imperfect,9 so proponents of ‘snowball Earth’
believe the models are wrong and need to be adjusted. Kirschvink et al.25 claim some models do predict runaway
glaciation with pack ice becoming 500–1,500 m thick, at least for the supposed
ice age that occurred about 2.4 billion years ago. They also believe the melting
of the ice in the Late Precambrian supplied the ‘trigger’ for evolution
of multicellular organisms.26

Painted into a corner

It seems as though evolutionists have painted themselves into
a corner with their ‘snowball Earth’ hypothesis. They have several near-impossible
problems to solve—all at a time when supposedly multicellular life was exploding
just before or during the Cambrian explosion. This time, they have two catastrophes
to work into their scenario. But evolutionists always seem to have another hypothesis
to add when boxed into a corner. If they only realized that the solution to the
crazy freeze-fry idea is to challenge the glacial interpretation of the particular
rocks. However, mainstream scientists have been unable to abandon their ancient
ice age story, so they are stuck with their ‘weird and bizarre’ freeze-fry
world, terms used by Kerr.6 For creationists, the rocks
and their associated ‘glacial diagnostic features’ can be explained
very easily. They are the result of gigantic submarine landslides in a warm ocean
that was precipitating carbonates in the early part of the Genesis Flood.15

References

Till is a mixture of rocks of all sizes within a fine-grained matrix.
It is common over the surface of the mid- and high-latitude continents. Till is
associated with a post-Flood rapid ice age that uniformitarian geologists call the
Late Cenozoic or Pleistocene ice age. See: Oard, M.J.,
An Ice Age Caused by the Genesis Flood, Institute for Creation Research,
El Cajon, 1990. Return to text.

God did it in six days and rested on the seventh. A good model to follow as individuals but corporately, CMI provides new articles 7 days a week, 52 weeks a year. Will you consider a small gift to support this site? Support this site